The types of military forces in the Napoleonic Wars represented the unique tactical use of distinct military units, or their origin within different European regions. By and large the military forces during the period had not changed significantly from those of the 18th century, although their employment would differ significantly.
Military forces during the Napoleonic Wars consisted largely of the three principal combat arms, and several combat support services, and included the infantry, cavalry, artillery, engineers, and logistics troops which were called the army train during the period. The period gave a start to what are today military staffs to help administer and organise forces in the field and in garrisons, and supervise training of conscripts and recruits. Much of the staff work was performed by staff officers and often Aide-de-camps to senior officers, and included the officers of the Quartermaster general.
Combat Arms of the Napoleonic Armies were those troops that did most of the killing and dying on the battlefields of the wars. For most of the troops this meant either facing their enemy's musket and rifle fire at about 150 yards, being fired on by artillery firing cannon balls and canister ammunition, or fighting with the sabres, lances and bayonets.